<html>
        <head>
            <title>000</title>
            <meta charset="utf-8">
            <style>
                a:link, a:visited, a:hover, a:active{
                    color: #2C58E7;
                    text-decoration: none;
                }
                html, body{
                    width: 100%;
                    height: 100%;
                    margin: 0;
                    padding: 0;
                }
                #container{
                    position: relative;
                    margin: 0 auto;
                    top: 50%;
                    transform: translateY(-50%);

                    width: 800px;
                    height: 500px;
                    background-color: #ccc;
                    border: 1px solid black;
                }
            </style>
        </head>
    
        <body>
            <div id="container">
            </div>
        </body>
    </html>